A mainframe computer is a large computer, usually housed in controlled environment, that can support the processing requirements of hundreds and often thousands of users and computer professionals.

• 一台主计算机是一台大型计算机，通常放置在一个受控制的环境中，它可以支持几百个、甚至常常是几千个用户和计算机专业人员的处理需要。